Leafless parasitic twining plants. [Cuscuta], in [Convolvulaceæ], [370]
Leaves opposite, their bases or petioles connected by stipules or a stipular line. [Loganiaceæ], [345]
Leaves when opposite without stipules.
Stamens free from the corolla or nearly so; style 1. [Ericaceæ], [309]
Stamens almost free from the corolla; style none. [Ilicineæ], [107]
Stamens in the sinuses of the corolla; style 1. [Diapensiaceæ], [326]
Stamens inserted on the tube of the corolla,
Four; pod 2-celled, circumscissile. [Plantaginaceæ], [422]
Four; ovary 2–4-celled; ovules solitary. [Verbenaceæ], [401]
Five or rarely more.